Sharp eye, sir. I do think that is copper. I did spend some time with Hoppes Elite so it may be leftover from that wash-out. Is it reasonable that <500 rounds through this barrel would justify that much copper removal if bullets are not dinging the muzzle device on the way out?
I do not actually see any signs of contact when looking closer at the edge of the muzzle and inside the FH. I do see what I believe should be adequate clearance. I will certainly take her to the range with FH removed to observe results. Thank you.



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